#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

void solve() {
    ll a, b, c, d, N;
    cin >> a >> b >> c >> d >> N;
    ll m = abs(a*d - b*c);
    set<pair<ll, ll>> S;
    rep(i, N) {
        ll x, y;
        cin >> x >> y;
        ll z = d * x - c * y;
        ll w = b * x - a * y;
        if (m) {
            z = (z%m + m) % m;
            w = (z%m + m) % m;
        }
        S.insert(mp(z, w));
    }
    cout << sz(S) << endl;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout << fixed << setprecision(15);
	solve();
	return 0;
}